From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sergei Shtylyov Subject: Re: [PATCH RFC 1/2] tun: don't require serialization lock on tx Date: Wed, 13 Apr 2016 17:26:01 +0300 Message-ID: <570E56F9.7030200@cogentembedded.com> References: <425e8f69ffd8fe315ef9d3cc678519c7060fb2e0.1460393493.git.pabeni@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Cc: "David S. Miller" , "Michael S. Tsirkin" , Hannes Frederic Sowa , "Eric W. Biederman" , Greg Kurz , Jason Wang To: Paolo Abeni , netdev@vger.kernel.org Return-path: Received: from mail-lf0-f48.google.com ([209.85.215.48]:34419 "EHLO mail-lf0-f48.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S964849AbcDMO0F (ORCPT ); Wed, 13 Apr 2016 10:26:05 -0400 Received: by mail-lf0-f48.google.com with SMTP id j11so72059295lfb.1 for ; Wed, 13 Apr 2016 07:26:04 -0700 (PDT) In-Reply-To: <425e8f69ffd8fe315ef9d3cc678519c7060fb2e0.1460393493.git.pabeni@redhat.com> Sender: netdev-owner@vger.kernel.org List-ID: Hello. On 4/13/2016 12:04 PM, Paolo Abeni wrote: > The current tun_net_xmit() implementation don't need any external > lock since it relay on rcu protection for the tun data structure s/relay/relies/? > and on socket queue lock for skb queuing. > > This patch set the NETIF_F_LLTX feature bit in the tun device, so > that on xmit, in absence of qdisc, no serialization lock is acquired > by the caller. > > Signed-off-by: Paolo Abeni [...] MBR, Sergei